发生炉煤气在电除尘器中爆炸与泄爆过程的数值模拟

发布时间：2019-06-13 16:17

【摘要】：为实现电除尘器在发生炉煤气净化中的应用,解决发生炉煤气的防爆与泄爆问题,文中采用RNG k-ε湍流及燃烧模型,对发生炉煤气在电除尘器中的爆炸及泄爆过程进行了数值模拟研究,分析了初始温度、初始压强、局部高氧气团对爆炸压力的影响,并对泄爆阀孔径对泄放效果的影响进行了研究。结果表明,最大爆炸压力随初始压力增大而线性增大,但随初始温度的升高而急剧下降;局部高氧气团爆炸使泄爆阀开启的临界直径为1.2 m,此时气团与电除尘器体积比为0.04;泄爆阀开启泄出的气体速度和温度较高,易引发二次爆炸;在1.4 m直径局部气团爆炸基础上,400 mm泄爆阀泄压时间为0.17 s,直径600 mm和800 mm泄爆阀的泄爆时间分别较之提高了72.3%和82.3%。
[Abstract]:In order to realize the application of the electric dust collector in the gas purification of the producer gas, the explosion-proof and explosion-proof problems of the producer coal gas are solved. The RNG k-turbulent flow and the combustion model are used to simulate the explosion and explosion of the producer coal gas in the electric dust collector. The influence of initial temperature, initial pressure and partial high-oxygen group on the explosion pressure is analyzed, and the influence of the pore diameter of the vent valve on the discharge effect is studied. The results show that the maximum explosion pressure increases linearly with the increase of the initial pressure, but decreases sharply with the increase of the initial temperature. The critical diameter of the vent valve is 1.2 m, and the volume ratio of the air mass to the electrostatic precipitator is 0.04. The gas velocity and temperature of the vent valve are high and the secondary explosion is liable to be induced; on the basis of the local air mass explosion of 1.4 m, the pressure relief time of the 400mm vent valve is 0.17 s, and the explosion time of the vent valve with the diameter of 600 mm and 800 mm is 72.3% and 82.3%, respectively.
【作者单位】：燕山大学机械工程学院;燕山大学环境与化学工程学院;
【基金】：河北省自然科学基金资助项目(E2015203236) 河北省重大技术创新项目(10273920z)
【分类号】：X701.2;X932

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